Eddy current causes image distortion including translation, scaling, and sheering.<div>patient motion causes image translation and rotation.</div><div><br></div><div>Sometimes it is difficult to distinguish translation by eddy current and patient motion.</div>
<div><br></div><div>Both (eddy and motion) cause image registration issue, which are simultaneously corrected by post-processing image registration.</div><div>If you use "rigid transformation" for the post-processing image registration, you can correct only translation and rotation (motion and a part of eddy current distortion).</div>
<div>If you use "affine", in theory, you can correct all of them at once.</div><div><br></div><div><br><br><div class="gmail_quote">On Wed, Jan 30, 2013 at 3:30 PM, Dorian P. <span dir="ltr"><<a href="mailto:alb.net@gmail.com" target="_blank">alb.net@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi all,<div><br></div><div>I sent this question before and would appreciate any comment on it. </div><div><br></div><div>
It looks like eddy current correction is applied in DTIstudio only for affine registration (not for rigid body). This is true for AIR and Mutual Registration as far as I know. Is there a particular reason for this? Why not applying eddy current correction for rigid body too?</div>
<div><br></div><div>Thank you.</div><span class="HOEnZb"><font color="#888888"><div><br></div><div>Dorian</div>
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